I've been having issues with my front driver side door and rear passenger driver side. For a while it was only the front driver side door, I would go to close the door and it wouldn't latch.. I used wd40 thinking maybe the latch on the inside was sticking but that didnt help.. 4 days later is started working... now the problem is gone. Now the rear is doing the same thing.. no latching. When I press the lock button I can still hear a noise like it's locking but the latch is not keep the door closed.

 

Could be a fault in the central locking system. Could be a weak battery issue. How old is the battery inside the car?
It's worth a try by disconnecting and wait for 5 minutes before reconnecting the battery cable to do a reset and let's hope it's not the problem in the actuator